分子一阶超极化率溶剂效应的理论研究

基于一维谐振子模型建立了极性溶剂对光学二阶非线性分子一阶超极化率产生影响的简化理论模型,推导出了非线性分子的线性极化率α和一阶超极化率β的表达式. 以对硝基苯胺为例,所建立的理论模型计算结果较好地解释了实验获得的溶剂极性对其分子线性吸收峰波长（λ_p）和β值的影响.     

新型一维配位聚合物{[Cu(H2L)(HL)](ClO4)·3H2O}n的合成及其晶体结构

Cu(ClO4)2·6H2O与H2L{L=[2,3-f]-吡嗪[1,10]邻菲咯啉-2,3-二甲酸}反应合成了新型一维配位聚合物{ [Cu(H2L) (HL)] (C1O4)· 3H2O}n(1),其结构经UV,IR,XRD和元素分析表征. 1属单斜晶系,空间群C2/c,晶胞参数a=3.575 9(13) nm,b=0.962 7(3)nm,c=2.127 5(10)nm,β=116.106(8)°,V=6.577(5) nm3,Z=8,Dc=1.730 g·cm-3,Mr=856.56,F(000)=3 480,μ=0.837nm-1,R=0.082 6,wR=0.248.Cu2+分别与1个H2L的两个氮原子,2个不同μ2-HL的两个氮原子和一个羧酸氧原子配位,形成畸变四方锥的五配位构型.Cu(Ⅱ)通过HL桥联形成一维链,相邻一维链的芳环π-π堆积和分子间氢键作用使1构筑成三维超分子结构.     

金纳米簇化学发光体外生物检测应用研究进展

金纳米簇是一种制备工艺简单、具有分子级尺寸和量子效应的新型发光材料,近年来在化学发光检测中得到了广泛应用,特别是较多应用于体外生物检测.本文综述了金纳米簇化学发光(含电化学发光)体系在体外生物检测中的应用进展.首先,阐释了金纳米簇的合成方法、结构、性质及其化学发光基本原理;其次,总结了国内外近年来基于该体系的体外生物检...     

pH值敏感相分离特性的蛋白质酶解试剂研究

通过DEC/NHS偶联反应将胰蛋白酶(Trypsin)连接到具有pH值敏感性的壳聚糖(CS)链上.Trypsin-CS偶联物保留了CS的pH值敏感相分离特性及Trypsjn的酶催化活性.浊度滴定实验表明,此偶联物的临界相分离pH值(CPSP)仍保持在偏中性范围内,并且随CS的分子量降低而略有上升.这种偏中性的CPSP值...     

High-sensitivity temperature sensor based on Bragg grating in BDK-doped photosensitive polymer optical fiber

A single-mode polymer optical fiber (POF) with highly photosensitive core doped with benzil dimethyl ketal (BDK) is fabricated and used for writing Bragg grating through the two-beam interference method. The Bragg wavelength of the grating is about 1570 nm, while the full-width at half-maximum (FWHM) of the reflection peak is 0.3 nm. The temperature response of POF Bragg grating is theoretically analyzed and experimentally measured in contrast to silica optical fiber Bragg grating (FBG). The result shows that the temperature character of POF Bragg grating is negative, which is opposite to the silica optical FBG. The absolute value of the temperature response of POF Bragg grating is one order of magnitude higher than that of the silica optical FBG, making POF Bragg grating appear to be very attractive for constructing temperature sensors with high resolution.     

新型荧光试剂5-(4-氯苯偶氮)-8-(4-甲氧基)苯甲醛缩氨基喹啉的合成及荧光性质

近十几年来,有机试剂在荧光分析中的应用日益广泛,有机荧光试剂的合成及应用已是发展荧光分析的重要手段[1].8-氨基喹啉类衍生物是一类较好的荧光试剂和光度试剂[2,3].为了开发新的荧光试剂,我们首次合成了含偶氮基的Schiff碱类化合物5-(4-氯苯偶氮)-8-(4-甲氧基)苯甲醛缩氨基喹啉,通过IR,1H-NMR确证了其结构,并初步测试了其荧光性能.     

REPLICA SOLUTION TO QUANTUM INFINITE RANGE HEISENBERG MODEL

By using replica method and Matsubara imaginary-time functional-integral technique, the quantum infinite range Heisenberg model is solved. The solution shows that the quantum infinite range Heisenberg model also has phase transition.     

Pr,Yb：ZBLAN上转换发光过程中的能量

详细地研究了Ｐｒ＾３＋，ＹＢ＾３＋，ＺＢＬＡＮ玻璃中Ｐｒ＾３＋和Ｙｂ＾３＋离子之间的能量传递过程，及能量传递对上转换发光的影响。实验结果表明，在９６０ｎｍ激光泵浦下Ｙｂ＾３＋通过Ｙｂ＾３＋－Ｐｒ＾３＋之间的交叉弛豫向Ｐｒ＾３＋传递能量。具体的能量传递形式有三种。     

Infinite－Range Quantum Dzyaloshinskii－Moriya Spin Glass Model

Based on the replica method and the imaginary time functional-integral technique, we investigate the infinite-range quantum Dzyaloshinskii-Moriya spin glass model. It is found that the quantum Dzyaloshinskii-Moriya spin glass model behaves in a Heisenberg-like manner. The specific heat has the crossover behaviour. The broad Maximum in specific heat is shifted to higher temperature with increasing applied field. These features are in good agreement with the observation of Brodale et al. [J. Magn. Magn. Matter. 31-34 (1983) 1331] The susceptibility of the system has the typical spin glass feature.     

脉冲中子闪烁探测器的工程可靠性设计与提升

针对一种在复杂环境条件下进行脉冲中子探测的闪烁探测器,开展了一系列的可靠性设计、保证工作。在设计上通过双通道冗余备份、抗振设计等方式提升了探测器的固有可靠性。此外还采取可靠性建模及指标分配的方式明确了探测器各部件的任务可靠性目标,通过FMECA分析方法研究了探测器各部件的故障模式及其影响,确定了可靠性重要部件。通过运用环境应力筛选试验及可靠性强化试验,进一步提升了探测器的可靠性。经初步验证,采取上述可靠性设计保障技术的脉冲中子探测器,其任务可靠度可达到99.9%以上。